Move cc::LayerSettings to cc/layers/layer_settings.h.

cc/layers/layer_proto_converter.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/layer_proto_converter.h"
 
 #include "base/stl_util.h"
 #include "cc/layers/layer.h"
+#include "cc/layers/layer_settings.h"
 #include "cc/proto/layer.pb.h"
 #include "cc/trees/layer_tree_host_common.h"
 #include "cc/trees/layer_tree_settings.h"
 
 namespace cc {
 
 LayerProtoConverter::LayerProtoConverter() {}
 
 LayerProtoConverter::~LayerProtoConverter() {}
 
@@ skipping 86 matching lines @@
     case proto::Base:
       return Layer::Create(LayerSettings()).get();
   }
   // TODO(nyquist): Add the rest of the necessary LayerTypes. This function
   // should not return null.
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace cc